Summer Patch

Question 1

Summer Patch

Cause:

Answer 1

tel. Magnaporthe poae

ana. Phialophora spp.

Question 2

Summer Patch

Host:

Answer 2

Poa spp.

Festuca spp. (fine fescues)

Question 3

Magnaporthe poae

SIgn:

Answer 3

Darkly pigmented ectotrophic runner hyphae with lobed hyphopodia
Asci and Ascospores - In a Lab only!!

Question 4

what is the structure called that the Magnaporthe poae hyphae uses to penetrate the root tissue of plants?

Answer 4

lobed hyphopodia

Question 5

What is a hyphopodia?

Answer 5

a strawlike structure that the hyphae develops to penetrate the roots of the plant and suck out nutrients.

Question 6

Magnaporthe poae

disease cycle:

Answer 6

Hyphae inserts the lobed hyphopodia, sucks out nutrients of live plants…which results in Plant roots that dysfunction and don’t work well. It doesn’t want to kill the plant because then it cant survive….once it warms up, turf begins to decline and the hyphae slowly moves on to another host.

Question 7

Magnaporthe poae

Symptoms

Answer 7

dinner plate sized patches of wilting/dead turf.

“frog eye” rings of dead turf

Question 8

What causes the “frog eye” ?

Answer 8

can be multiple things:

• disease in mixed turf stand may only kill one species and the other survives(ex. poa and rye)
• weeds invade the dead area and begin to grow inside of it

Question 9

Magnaporthe poae

Predisposing factors:

Answer 9

• Soil temps average 65°F for several days
• Disease develops between 65° and 82°
• Excess soil moisture
• High pH
• Heat and drought stress
• Short HOC

Question 10

Summer Patch

disease management:

Answer 10

• Mow at recommended cutting heights
• overseed with non host grass
• Syringe to reduce root stress
• Aerify to reduce compaction
• improve drainage

Question 11

Summer Patch

Fertility Management:

Answer 11

• Reduce soil pH to 5.5 - 6.2 w/ ammonium source N
• irrigate immediately after fertilizer application
• use lime sparingly to maintain soil pH

Question 12

What classes of fungicides work effectively on summer patch? give an example for each one…

Answer 12

DMI - ex. Triticonazole
Qoi - ex. Azoxystrobin
MBC - ex. benomyl

Question 13

What fungicide makes summer patch worse?

Answer 13

Daconil

Question 14

Chemical Control…What to use and when?

Answer 14

• Begin treatments when soil stabilizes at 65°F at 2” depth
• use High label rates
• Use at least 2 gallons water/1000
• Repeat at 28 day intervals
• Add Primo to the program

Question 15

Biological control for Summer Patch:

Answer 15

Companion will help but wont cure it. can be helpful to use it in combination with other products

Question 16

What is important to remember about dilution rates?

Answer 16

• Make sure you are using enough water to get the product down to the roots…
• Be aware of what turf species you’re dealing with because you dont want to drive the product past the roots either. - (Poa Annua has very shallow roots compared to Fescues)

Question 17

Can summer patch affect creeping bentgrass?

Answer 17

Yes.

Question 18

Summer Patch
Kingdom: ?
Phylum: ?

Answer 18

Kingdom: Fungi
Phylum: Ascomycota